| 42 | } |
| 43 | |
| 44 | double stddev() { |
| 45 | double avg = average(); |
| 46 | size_t n = _times.size(), skip = n / 10; |
| 47 | double total = 0; |
| 48 | for (auto t=_times.begin()+skip; t != _times.end()-skip; ++t) |
| 49 | total += ::pow(*t - avg, 2); |
| 50 | return sqrt( total / (n - 2*skip)); |
| 51 | } |
| 52 | |
| 53 | std::pair<double,double> range() { |
| 54 | sort(); |